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The car recently underwent a software update at the dealership for a backup camera issue.  When I was driving home on the highway, the car suddenly braked and the seat belts automatically tightened up.  This happened 3 additional times on the highway about 5 days later.  I had turned off the automatic braking system and it seemed to go away.  Then, with the system off, we experienced this again yesterday while on the highway at 70mph.   The braking lasts for 1-3 seconds. There is no audible alert or dashboard display.  IT renders the car quite unstable as it feels as though the rear brakes are being activated before the front.  I reported this to the dealership and they want to inspect the car.

MERCEDES-BENZ GLS 450 2023 FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

There have been 3 incidents where the car responded to unknown stimuli by braking hard.  3 months ago it happened while making a left turn through an intersection, driving about 10 mph the brakes unexpectedly locked up, luckily the person behind me took evasive action and didn't hit me;  2 weeks later it happened again, I was driving on I-45 attempting to pass slower drivers, the brakes dramatically engaged while I was driving over a slight hill, today it happened again when it mistook a vehicle in a different lane of traffic, and performed a hard brake evasive measure even though there was no chance of collision and nothing in front of the vehicle.

when coming to a stop and applying the break, the transmission stalled. a warning was issued around lane keeping assist and a second warning. Then the transmission light was on.   It was not at risk in the moment because no one was behind me and I was coming to a stop sign. If it prevented me from stopping I might have gone through the stop sign  It is at the dealership today to service.   no warning lamps, messages or other symptoms.

MERCEDES-BENZ GLS 450 2023 LANE DEPARTURE: ASSIST

The contact owns a 2023 Mercedes-Benz GLS450. The contact received notification of NHTSA Campaign Number: 23V880000 (Fuel System Gasoline) however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact stated while driving approximately 10 MPH and making a left turn, the vehicle stalled. The contact stated that an unknown warning was illuminated; however, when the vehicle was restarted, the warning light was off. The vehicle was taken to a dealer who was unable to duplicate the failure. The vehicle was not repaired. The contact stated that the failure reoccurred after receiving the recall notification. The failure mileage was approximately 11,000. Parts distribution disconnect.

MERCEDES-BENZ GLS 450 2023 FUEL SYSTEM, GASOLINE

Twice the vehicle has stalled while driving. I see that there is a recall on my model for a faulty fuel pump which causes this problem, but my dealer claims my vehicle is not part of the recall even though it is having the same issue.

MERCEDES-BENZ GLS 450 2023 FUEL/PROPULSION SYSTEM

2023 Mercedes-Benz GLS450 4matic — vehicle data sourced from FuelEconomy.gov.

Experience the robust Mercedes-Benz GLS450 4MATIC, a certified hybrid SUV engineered for performance and efficiency. With its powerful 375 hp engine and all-wheel drive, this vehicle delivers a combined 20 MPG, making it a capable and modern choice for your needs.

	2017	2018	2019	2020	2021	2022	2023
Price	—	—	—	—	—	—	$87,000
Engine Capacity	3L	3L	3L	3L	3L	3L	2999 cc
Fuel Type	Premium	Premium	Premium	Premium	Premium	Premium	Premium
Transmission	Automatic 9-spd	Automatic 9-spd	Automatic 9-spd	Automatic 9-spd	Automatic 9-spd	Automatic 9-spd	9-speed automatic
Body Type	Standard Sport Utility Vehicle 4WD	Standard Sport Utility Vehicle 4WD	Standard Sport Utility Vehicle 4WD	Standard Sport Utility Vehicle 4WD	Standard Sport Utility Vehicle 4WD	Standard Sport Utility Vehicle 4WD	SUV

Mercedes-Benz GLS450 4matic (2023) Specifications